The sticker price isn't the price. See your real total with sales tax, trade-in credit, and fees included.
Start with the vehicle price, add any trade-in value, pick your state to fill in a default sales tax rate, then adjust the doc fee and registration costs to whatever the dealer and the state actually charge. The total is what you owe at signing before financing.
Change the tax rate if the default does not match your county. State rates are the floor; many localities add their own percentage on top, and the combined figure is what appears on the contract.
A $32,000 car bought in Ohio, where the default rate is 5.75%, with a $500 doc fee and $250 in registration:
| Line | Amount |
|---|---|
| Vehicle price | $32,000 |
| Sales tax at 5.75% | $1,840 |
| Doc fee | $500 |
| Registration and title | $250 |
| Out the door | $34,590 |
Add a $4,000 trade-in and three lines change at once: the taxable amount drops to $28,000, the tax falls to $1,610, and the total comes to $30,360. The trade is worth more than $4,000 in this transaction because it also removes $230 of tax — a detail worth knowing when a dealer offers to buy your car outright instead.
The out-the-door number is the only price that matters, because it is the only one you actually pay. Advertised prices exclude tax, title, registration and fees, and a doc fee is a dealer charge that varies by state and, within a state, by dealer. Some states cap it; some do not.
Trade-in tax treatment varies. Most states tax the difference between the new car and the trade, which is the behaviour modelled here. A minority tax the full purchase price, and in those states the trade credit is worth strictly its cash value. Check your own state's rule before you assume the saving.
Rebates complicate the picture in the same way. A manufacturer rebate is usually applied after tax, so it saves the rebate amount and no tax, while a dealer discount reduces the taxable price. Two offers that look identical on the sticker can differ by hundreds of dollars in tax. Ask for the out-the-door figure in writing before you discuss financing, so the two are not tangled together.
Sometimes. They are often a fixed charge the dealer applies to every sale, but the total price is what you are negotiating, so the fee can be offset elsewhere in the deal.
No. Add anything you plan to buy to the total yourself. Those products are usually priced separately from the car.
They are part of the vehicle price if they are on the car when you buy it, and they are usually taxable. Ask for them to be itemised.
Because counties and cities add their own rates. Use the combined rate from your registration paperwork or the state's own calculator.
Partly. You pay tax on the monthly payment in most states rather than on the whole car up front, plus acquisition and disposition fees, so the structure differs.
Statewide rates are a starting point. Local add-ons and the trade-in rule have to be checked where you register the car.
Last updated: November 2, 2026. Reviewed by David Liu.